The major product formed in the following reaction is
F3 Vinanti Teaching 29.05.23 D17

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CSIR-UGC (NET) Chemical Science: Held on (15 Dec 2019)
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  1. F3 Vinanti Teaching 29.05.23 D18
  2. F3 Vinanti Teaching 29.05.23 D19
  3. F3 Vinanti Teaching 29.05.23 D20
  4. F3 Vinanti Teaching 29.05.23 D21

Answer (Detailed Solution Below)

Option 1 : F3 Vinanti Teaching 29.05.23 D18
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Concept:

The Danheiser annulation or Danheiser TMS-cyclopentene annulation is an organic reaction of an α,β-unsaturated ketone and a trialkylsilylallene (e.g., trimethylsilyl- or triisopropylsilyl-) in the presence of a Lewis Acid to give a trialkylsilylcyclopentene in a regiocontrolled annulation.
F3 Vinanti Teaching 29.05.23 D22

Mechanism:
  F3 Vinanti Teaching 29.05.23 D23
Conclusion:
The correc t answer is option 1.

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